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Pelagibacter, with the single species P. ubique, was isolated in 2002 and given a specific name,[1] although it has not yet been validly published according to the bacteria in the entire world. It can make up about 25% of all microbial plankton cells, and in the summer they may account for approximately half the cells present in temperate ocean surface water. The total abundance of P. ubique and relatives is estimated to be about 2 × 1028 microbes.[4]
It is rod or crescent shaped and one of the smallest self-replicating cells known, with a length of 0.37-0.89 carbon cycle.
Its discovery was the subject of "Oceans of Microbes", Episode 5 of "Intimate Strangers: Unseen Life on Earth" by PBS.[7]
Several strains of Pelagibacter ubique have been cultured thanks to improved isolation techniques.[8] The most studied strain is HTCC1062 (high-throughput cultivation collection).[1]
The factors that regulate SAR11 populations are still largely unknown. They have sensors for nitrogen, phosphate, and iron limitation, and a very unusual requirement for reduced sulfur compounds.[9] It is hypothesised that they have been molded by evolution in a low nutrient ecosystem, such as the Sargasso Sea where it was first discovered.[10]
A population of P. ubique cells can double every 29 hours, which is fairly slow, but they can replicate under low nutrient conditions.[11]
P. ubique can be grown on a defined, artificial medium with additions of reduced sulfur, glycine, pyruvate and vitamins.[12]
The genome of P. ubique strain HTCC1062 was completely sequenced in 2005 showing that P. ubique has the smallest [26]
HTTC1062 is the type strain of the species Pelagibacter ubique, which in turn is the type species of the genus Pelagibacter,[1] which in turn is the type genus of the SAR11 clade or family "Pelagibacteraceae".[25]
The term "Candidatus" is used for proposed species for which the lack of information (cf.[20]) prevents it from being a validated species according to the bacteriological code,[21][22] such as deposition in two public cell repositories or lack of FAME analysis[23][24] whereas "Cadidatus Pelagibacter ubique" is not in ATCC [4] and DSMZ [5], nor has analysis of lipids and quinones been conducted.
The name of the genus (Pelagibacter) stems from the Latin masculine noun pelagus ("sea") combined with the suffix -bacter (rod, bacterium), to mean "bacterium of the sea". The connecting vowel is an "i" and not an "o", as the first term is the Latin "pelagus" and not the Greek original πέλαγος (pelagos) (the word pelagus is a Greek word used in Latin poetry, it is a 2nd declension noun with a Greek-like irregular nominative plural pelagē and not pelagi[18]). The name of the specific epithet (ubique) is a Latin adverb meaning "everywhere"; it should be noted species with the status Candidatus are not validly published so do not have to be grammatically correct, such as having specific epithets having to be adjectives or nouns in apposition in the nominative case or genitive nouns according to rule 12c of the IBCN.[19]
It is found to have proteorhodopsin genes, which help power light-mediated proton pumps. Subtle differences arise in the expression of its codon sequences when it is subjected to either light or dark treatments. More genes for oxidative phosphorylation are expressed when it is subject to darkness.[17]
SAM-V riboswitch, and other cis-regulatory elements like the rpsB motif.[14][15] Another example of an important ncRNA in P. ubique and other SAR11 clade members is a conserved, glycine-activated riboswitch on malate synthase, putatively leading to "functional auxotrophy" for glycine or glycine precursors in order to achieve optimal growth.[16]
[6]
Fish, Amphipoda, Animal, Fresh water, Phytoplankton
Archaea, Anthrax, Cheese, Cyanobacteria, Cholera
Oxygen, Argon, Hydrogen, Helium, Gold
International Standard Serial Number, Brill's New Pauly, John Peter Oleson
Oxygen, Chlorine, Fluorine, Sicily, Periodic table
Plankton, Aquatic ecosystem, Biodiversity, Bioluminescence, Fresh water
Bacteria, Ocean, Metagenomics, Dna, Rna
Rfam, Rna, Cis-regulatory element, Riboswitch, Domain (biology)
Latin, Philip K. Dick, Canadian Military Engineers, Motto, Ubique (company)